It is very easy first is you need a youtube downloader and converter software at the same time. Once you have downloaded it you can convert it to MP3 or MP4 format then try dragging it to itunes. Connect your iPod then sync. Here is a link on where to download. - http://www.youtubetoipod.org/
Many factors determine the amount of pictures that can be stored 2GB of memory, such as size, megapixel of the camera they were captured with as well as the compression level of the images. Generally the 2GB will hold 1000 pictures or more.